They aren't opposites though. Its entirely possible to have something "easy to disable" and "difficult to accidentally disable".

Easy to disable, in that there are some easy to understand and find steps to disable it. Difficult to accidentally disable, meaning its not something that would be disabled as a side effect of some other change, isn't just a single click, isn't poorly labeled or described, etc.

In this case, it is first presented as a check box in the Privacy Settings area. It is titled "Screen security" and says "Prevent screenshots of Signal on this computer for added privacy.". Well documented. Click the check box, and it presents a modal window. The window then says, "Disable screen security? If disabled, this may allow Microsoft Windows to capture screenshots of Signal and use them for features that may not be private." You then have a Cancel or Disable buttons.

Its two steps to change it after navigating to that part of the menu. The positions to click are different between the two steps. It confirms if you're really wanting to disable it, and tells you things may be able to take screenshots of the app.

This reminds me of platforms which require you to type the name of a resource to delete something potentially important. It's easy to do, but one wouldn't accidentally click a button, type the full name of the resource, then click the confirm button.

My electric lawn mower is both easy to start the blade and difficult to accidentally start. You have to hold a button and then pull the start lever. Its two actions that you reasonably have to do with two hands in a particular order. Both actions are easy to do, doing both of them are easy (assuming you have two somewhat functional hands). Once going you just need to continue to hold the lever and just release that to stop the blade.

You're misreading things.

It's not "difficult to disable" && "easy to disable"

Its "difficult to accidentally disable".

Accidentally. Its another word in the sentence that radically changes the meaning of the phrase.

Read the whole sentence. Each word has meaning, you can't just ignore some of them.

Well then, I guess you're just intentionally misquoting it to drive confusion or something. "Difficult to do something" and "difficult to accidentally do something" are two radically different concepts. Typing in a password is easy, accidentally pressing random keys and having it be the password is hard. Pressing delete and then typing "delete me" and then clicking OK is pretty easy, accidentally clicking random spots on your screen and jamming random key presses and having it accidentally get deleted is hard. You may still have deleted something you later decide you shouldn't have, but you absolutely intentionally issued the delete.

Putting a cover over a button that can still be flipped open is a real-world example of making something difficult to accidentally do while still making it easy to actually do it. You pretty much have to want to press the button, you're not just going to set something down and accidentally trigger the button. Do you really disagree about that? How is it not making it more difficult to do on accident?

Or like my lawn mower example. How would I accidentally start the mower? You can see it would be difficult for me to accidentally start the mower, right? My hand wouldn't just brush against it and have it start going, correct? And it has a few other interlocks, such as the handle needs to be fully extended and locked at the right angle; you can't start it when its folded up. And yet this two-stage motion is still really easy to do for most people with two hands, right? And it's clearly documented on the mower how to do it with obvious glyphs that show it will start the blade.

And with the button cover, I wouldn't just end up leaning against the console and accidentally pressing the button, correct? But one can trivially just flip the cover and press the button still, right? But we made it more difficult to accidentally press it?

Meanwhile, they could have made it significantly easier to accidentally start the lawn mower. They could have made it without those interlocks. They could have just made the handle capacitive and any light brush with a hand would have started it. The button with a cover could have been made bigger and more sensitive and placed exactly next to where people naturally rest their hands or on the corner right at knee level ready to be bumped with no cover and unlabeled. So in these cases, its significantly harder to accidentally do the action than what it could have been, meanwhile still being generally pretty easy to do if you're intending to do it.

There are plenty of examples of things that are easy to do and at same time difficult to accidentally do. One that came to mind is the "slide to unlock" interface from the first iPhone.

I strongly disagree as I have accidentally slide-unlocked many a phone in my day. Maybe we just have different definitions of easy.

Then inputting a pin or most patterns instead! Easy to do, but extremely unlikely to happen accidentally.

You're the one that is looking for an example, you should be able to make that iteration yourself.

Child-proof caps are easy to take off but difficult to accidentally take off.

I don't consider those easy to take off but ok

not at all. "easy to disable" means you can easily find the place where and how to do it. "difficult to accidentally disable" means you can't disable it without intentionally going to the place and making that choice. of course there are cases where easy to change something also means easy to accidentally change it, and those are annoying. but they don't have to be like that.